物理学报2012，Vol.61Issue(15)：500-505,6.
基于光子晶体马赫.曾德尔干涉仪的太赫兹开关及强度调制器
Photonic-crystal-waveguide based Mach-Zehnder interferometer for terahertz switch and modulator
摘要
Abstract
We propose a novel tunable photonic crystal（PC） waveguide Mach-Zehnder interferometer（MZI） based on nematic liquid crystals （LCs） 5CB and investigate its interference properties numerically by using the finite-difference time-domain method.We can change the refractive index of LC by rotating the directors of the LC molecules.The line defect modes of the PC waveguide with different liquid crystal refractive indices are analyzed by using the plane wave expansion method.Owing to the slow group velocity region of the line defect mode,when the index of 5CB changes from 1.53 to 1.63,the variation of the effective index of the line defect mode arrives at 0.168.This property helps to significantly control the phase of light propagation in a PC waveguide MZI.The novel interferometer can be used as either an optically controlled on-off switch or an amplitude modulator in optical circuits.关键词
太赫兹/光子晶体/液晶/马赫-曾德尔干涉仪Key words
terahertz/photonic crystals/liquid crystals/Mach-Zehnder interferometer分类
信息技术与安全科学引用本文复制引用
王昌辉,赵国华,常胜江..基于光子晶体马赫.曾德尔干涉仪的太赫兹开关及强度调制器[J].物理学报,2012,61(15):500-505,6.基金项目
国家高技术研究发展计划（863） （）
国家自然科学基金 （）
天津市自然科学基金重点项目 （）
教育部博士点基金（批准号：20090031110033）资助的课题 （）
